package com.itheima.filter;

import com.itheima.utils.CurrentHolder;
import com.itheima.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
@Slf4j
//@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取到请求路径
        String requestURI = request.getRequestURI();
        //2.判断是否是登录请求，如果路径中包含/login，说明是登录请求，直接放行
        if (requestURI.contains("/login")){
            log.info("登录请求，放行");
            filterChain.doFilter(request,response);
            return;
        }
        //3.获取请求头中的token
        String token = request.getHeader("token");
        //4.判断token是否存在，如果不存在，说明用户没有登录，返回错误信息（响应401状态码）
        if (token == null||token.isEmpty()){
            log.info("令牌为空，响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return;
        }
        //5.如果token存在，校验令牌，如果校验失败，返回错误信息（响应401状态码）
        try {
            Claims claims = JwtUtils.parseToken(token);
            Integer empId = Integer.valueOf(claims.get("id").toString());
            CurrentHolder.setCurrentId(empId);
            log.info("当前登录员工ID:{}",empId);
        } catch (Exception e) {
            log.info("令牌非法，响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return;
        }
        //6.校验通过，放行
        filterChain.doFilter(request,response);

        //7.删除ThreadLocal中的数据
        CurrentHolder.remove();
    }
}
